If you can't run your anti virus or spyware programs, you have downloaded something nasty. Your registry corruption message is not good either. I know it's a pain to reload windows and all the software is a pain but so is having your computer crash at unexpected moments. What if you just saw that one of your stocks had bad earnings and you wanted to bail and your computer crashes???
I would go to cnet.com or zdnet.com and look under utilities for a program that will try to fix your registry problems. Maybe that's what is causing your computer to crash all the time. Most are shareware so you can use it to fix your problem before you decide if you want to pay. If it makes the problem worse, you can still reload windows. But if it works, you can see if that allows you to fix the virus and spyware problems. Also try avast.com. They have a free anti virus scan.
BTW do all this after the market closes on Friday so you have all weekend to fiddle with it. It is going to be frustrating so allocate the time to do it right. If all else fails, Dell has cheap computers for $299!! LOL! Good luck, Bobwins